Respuesta :

Hello User

To do this we need to first add all of the numbers together.

-18 + -14 + 11 + 13 = -8

The next step is to divide the result by how many pairs of numbers there are.
As you can see there are 4 pairs of numbers

So we divide -8 by 4 to get -2

Therefore -2 is the answer to this problem

I hope I helped :-)

-Chris 

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